212 



Orthoceras Winnipegense, Whiteaves. 



Orthoceras Winnipegense, Whiteaves 1891. Trans. Royal Soc. Canada, vol. IX., 



sect. 4, p. 82, pi. 8, figs. 4 and 4, a-b. 



"Shell narrowly elongated, somewhat fusiform, very slightly inflated in- 

 advance of the midlength ; outline of transverse section nearly rounded 

 but approaching to elliptical. Septate portion cylindro-conical, and 

 increasing very slowly in thickness ; chamber of habitation broadly but 

 shallowly constricted in the middle, and a little narrower at the aperture 

 than at its commencement. Surface markings unknown, though the 

 interior of the test is marked by closely disposed and exceedingly minute, 

 transverse raised lines. Septa, as shown in the longitudinal section 

 represented by fig. 4b," on Plate 8, of the ninth volume of Transactions of 

 the Royal Society of Canada, " seven millimetres and a half apart ftt the 

 smaller end, and eight mm. at the larger, as measured at their broadest 

 part, next to the siphuncle ; siphunole slightly eccentric, narrow, almost 

 cylindrical, but faintly constricted at the septa." 



Little Black Island, Lake Winnipeg, two specimens ; and south end of 

 Berens or Swampy Island, about eight miles from Little Black Island, one 

 specimen; all three collected by Messrs. Dowling and Lambe in 1890. 



The specimen from Little Black Island, which is figured on Plate 8, 

 figure 4, of the publication already referred to, has about three inches of 

 the chamber of habitation preserved and a little more than three and 

 a-half of the septate portion. The specimen from Berens Island, which 

 is septate throughout but imperfect at both ends, is five and a-half inches- 

 in length, by about thirty-six millimetres in its maximum diameter at the 

 larger end and twenty-nine at the smaller. 



Orthoceras m4Gnisulcatum, Billings. 



OHhoccra.i Tnagnis^tlcatum, }iil\mg& .1857. Geol. Surv. Canada, Rep. Progr. 



1853-56, p. 330. 



A characteristic specimen of this species, which was previously known 

 only from a fragment an inch and a-half long, from the Hudson River, 

 formation at Oharleton Point, Anticosti, was recentlv given to Mr. 

 Tyrrell at Selkirk, Maniioba. The colour of the matrix shews that this 

 specimen, which consists of a portion of the body chamber and of eight 

 septa, is probably from the limestones of the Red River Valley or Lake 

 Winnipeg, but the exact locality at which it was collected is unfortunately 

 unknown. 



Orthoceras Selkirkense, Whiteaves. 



iirtkoceras Selkirkense, Whiteaves 1891. Trans. Royal Soc. Carnada, vol. IX... 



sect. 4, p. 82, pi. 8, figs. 2 and 2, u. b. 



